Mechanical motion device

ABSTRACT

A stationary frame having a flat planar surface is provided with one or more upstanding members which may be adjustably mounted on the planar surface in a plurality of fixed positions. A relatively flat movable rotor is positioned on the planar surface at the frame in contact with the fixed projections at two or more speced points whereby upon turning movement of the rotor relative to the projections while maintaining at least a two point contact therewith, a point on said rotor will travel in a closed path having a specific configuration.

United States Patent [191 Jensen et al.

[ Dec. 31, 1974 MECHANICAL MOTION DEVICE [76] Inventors: Preben W.Jensen, 21 Southside Ave., Sommerville, NJ. 08876; Ole R. Jensen, 126Nottingham St., Montvale, NJ. 07645 [22] Filed: Oct. 8, 1970 [21] Appl.No.: 79,107

[52] US. Cl. 33/27 L [51] Int. Cl. B431 11/00 [58] Field of Search 33/27K, 27 L, 31. 27 F; 74/63 [56] References Cited UNITED STATES PATENTS1,878,633 9/1932 l-loferer 33/27 K 2,468,320 4/1949 Arnemann 33/312,624,117 l/l953 Daci 33/27 C 3,167,863 2/1965 Komorowski. 33/30 A3,465,445 9/1969 Fisher 33/27 C FOREIGN PATENTS OR APPLICATIONS 733,2595/1966 Canada 33/27 L Primary Examiner-Harry N. Haroian Attorney, Agent,or Firm-Sughrue, Rothwell, Mion, Zinn and Macpeak [5 7] ABSTRACT Astationary frame having a flat planar surface is provided with one ormore upstanding members which may be adjustably mounted on the planarsurface in a plurality of fixed positions. A relatively flat movablerotor is positioned on the planar surface at the frame in contact withthe fixed projections at two or more speced points whereby upon turningmovement of the rotor relative to the projections while maintaining atleast a two point contact therewith, a point on said rotor will travelin a closed path having a specific configuration.

6 Claims, 12 Drawing Figures PATENTEUDE 3,857. 187

SHEET 1 [1F 5 FIGI INVENTORS PREBEN W. JENSEN OLE R. JENSEN ATTORNEYSPATENTED I974 3.857. 1 87 SHEET 4 0F 5 11m iimmniii FIGIZ PATH-M0 1974SHEET 5 OF 5 FIGIO FIGII BACKGROUND OF THE INVENTION 1. Field of theInvention The present invention relates to mechanical motion devices ingeneral and more particularly relates to a mechanical motion devicewhereby a point on a movable rotor will generate a closed curve.

2. Prior Art Mechanical devices for generating a plurality of decorativedesigns are well known in the art and generally involve one or moremovable elements which are constrained by gear teeth, fixed pivot pointsand/or movable pivot points to move in a predetermined path rela tive toeach other. A marking instrument, such as a pencil, may be fastened to amovable element at a plurality of selected points so that the pencilwill scribe a plurality of decorative designs on a sheet of paper as themembers move relative to each other. Still other mechanical drawingdevices utilize a complicated arrangement of pulleys and drive beltswhich in turn are combined with a plurality of pivoted levers and gears.Still other mechanical drawing devices utilize a driving arrangement fora plurality of magnets which in turn cause other marker carrying magnetsto traverse a particular path on a sheet of paper.

The majority of these prior art mechanical drawing devices are generallyexpensive to manufacture due to the need for forming the various gearteeth and for pivotally connecting the various elements to each other.The magnetically actuated devises suffer from a lack of accuracy due tothe indirect magnetic connection between the moving parts.

SUMMARY OF THE INVENTION The present invention provides a mechanicalmotion device which may be utilized as a mechanical drawing device or asa means for translating one form of mechanical motion into another.

The present invention provides a mechanical motion device which isinexpensive to manufacture since it is substantially free of gear teethand needs no pivoted members.

The present invention provides a device which is extremely accurate inproducing repetitive designs since the movable member is maintained indirect contact with the statonary members at all times.

The present invention provides a mechanical motion device which whenprovided with a suitable marking device, is capable of providing aplurality of unique and attractive designs. The mechanical motion deviceaccording to the present invention is comprised of a frame member havinga substantially planar surface upon which one or more projecting membersmay be fixed in a plurality of adjusted positions. A rotor is pressedinto contact with the projections in at least two spaced points and uponrotation of the rotor about the projections, a selected point on saidrotor will describe a closed path.

The present invention provides a unique spring loaded pencil holder sothat the pressure on the point of the pencil will remain substantiallyconstant independent of the pressure exerted on the rotor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a device comprised of twostraight bar members adjustable relative to each other and a rotorhaving two curved surfaces disposed in contact with said bars.

FIG. 2 shows a device similar to FIG. I with the addition of springbiased means for holding the movable rotor in contact with said bars.

FIG. 3 shows a second embodiment having two fixed rollers and a rotorhaving a plurality of curved surfaces bearing thereagainst.

FIG. 4 shows a third embodiment wherein a curved rotor is disposedwithin a rectilinear frame member for rotation therein while maintainingfour point contact.

FIG. 5 is a fourth embodiment showing a curved rotor disposed within adouble rectilinear frame, the parts of which are adjustable relative toeach other to vary the opening for receiving said rotor.

FIG. 6 is a fifth embodiment wherein a curved rotor is disposed within atriangular frame member which in turn may be angularly adjusted within acircular frame member having a plurality of index notches therein.

FIG. 7 is a sectional view showing several features applicable to all ofthe embodiments.

FIG. 8 shows a sixth embodiment wherein a rotor having a slot and aroller is disposed in engagement with a pin and a closed curved track,respectively, on the frame.

FIG. 9 shows a seventh embodiment wherein a rotor having a plurality ofangularly disposed grooves on the underside thereof, is disposed withthree stationary rollers located in said grooves.

FIG. 10 shows an eighth embodiment wherein a rotor having two normalgrooves in the under surface thereof is disposed with two stationaryslide members located in said grooves.

FIG. 11 shows a ninth embodiment wherein a plurality of rollers arefixed in a circular pattern on a frame member with a rotor havingangularly related straight line surfaces thereon bearing against saidrollers.

FIG. 12 shows a tenth embodiment wherein a rotor having acircularopening and a curved groove is disposed in engagement with twostationary rollers at tached to the frame and received in the circularopening and circular groove.

DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings, thepreferred embodiments of the invention will now be described as appliedto a mechanical drawing machine, although not limited thereto. Referringnow to FIG. 1, the first embodiment consists of a base plate or surfacemember 20 constructed of a material which presents a smooth surfacewhich can be easily penetrated by a sharp pointed object, such as a pinor similar device. Such material may include cork, fiber board, or anyother suitable material. The base plate 20 can also incorporate ametallic member therein to which permanent magnets would be attracted. Asheet of paper on which a pattern is to be drawn is placed on a baseplate 20. A stationary bar or guide rail 22, having needlelikeprojections or permanent magnets located in the ends thereof is thenplaced on top of the piece of paper and attached to the base plate byforcing the pins into the base plate material or utilizing the permanentmagnets to attract a metallic sheet therein. A second adjustable bar orguide rail 24 having pin-like projections or permanent magnets in theends thereof is then placed on the paper and attached to the base platein an angular spaced-apart relationship with the fixed or stationaryguide rail 22. Preferably, the rail 24 pivots about a dowel 25 which inturn is secured to the base. Although the adjustable guide rail 24 isshown as being a separate member from the stationary guide rail 22,these guide rails may be connected together at a common point at one ofthe ends of each rail. A rotor member 36 having any desired number ofopenings 38 therethrough is placed between the two guide rails 22 and 24to obtain a twopoint contact therewith. A pencil, scribe, or any similartype of marking device is placed through one of the openings 38 in therotor 36 and a manual force is exerted against the marking means tocause the rotor 36 to rotate about its instantaneous center whilesimultaneously sliding along the two guide rails 22 and 24, andmaintaining a two point contact therewith, as indicated by P, and P atall times. The rotor 36 will then be caused to simultaneously rotate andslide along the guide rails 22 and 24. Such movement will cause theselected opening 38 to generate a curved pattern on the surface of thepaper, as indicated by the line 50. By placing the openings 38 atvarious locations on the rotor 36, an infinite number of patterns 50 maybe generated and placed on the paper. The number of patterns may beincreased by substituting elongated curved rails for the straight railsor by the use of a different rotor.

The adjustable bar or guide rail 24 may incorporate an adjusting meansattached to the end of the guide rail 24 opposite the end connected toor extending toward the fixed or stationary guide rail 22. Such anadjusting means may include a guide slot 26 located in the base plate 20or in a separate member attached to the base plate 20. A clamping means,such as a screw and nut assembly 28 may be used to clamp the adjustableguide rail 24 in the desired angular position. A scale 30 may be used toaccurately position the adjustable guide rail 24. Although the adjustingmeans shown in FIG. 1 is described as a nut and bolt type of clampingmeans, and type of securing means, such as a sharp pointed pin orpermanent magnet located in the end of adjustable guide rail 24 may beused.

A modification of the embodiment of FIG. 1 is illustrated in FIG. 2, inwhich a biasing lever or bar is pivoted about a pivot point or shaft 41and biased into engagement with the rotor 36 by means of a biasingspring 42 to assist the rotor 36 in maintaining a twopoint contact atall times with the guide rails 22 and 24 as the rotor 36 is rotated bymeans ofa pencil or similar instrument projected through an opening 38and simultaneously maintaining a sliding contact with the guide rails 22and 24. The pivot 41 may be formed in one of the rails or mayincorporate a sharp pointed pin or permanent magnet fixed to one endthereof for attaching the biasing lever 40 to the base plate 20independently of the fixed guide rail 22. The use of spring biased leveror bar 40 to assist in maintaining the two point contact between therotor 36 and the two guide rails 22 and 24 makes the use of the drawingapparatus of FIG. 1 much easier for an unskilled person to use. Suitablespring biased means may be used with any of the embodiments where it isnecessary to maintain an unconstrained rotor in engagement with theframe.

In the second embodiment shown in FIG. 3, a base plate 20 constructed inthe same manner as the base plate in FIG. 1 has two rollers 44 securedthereto. The

rollers 44 may be rotatably attached to pivot points 46. The pivot point46 may be in the form of dowel rods or similar cylindrical shapedstructures. Sharp pointed pins or permanent magnets may be located inone end of the pivot points 46 for attaching the rollers 44 to the baseplate, with the material on which a pattern is to be traced placedtherebetween. An oval shaped rotor 36 having a plurality of openings 38therethrough is maintained in two point contact with the rollers 44, asindicated at P, and P in the same manner as the embodiment shown in FIG.I. A drawing instrument, such as a pencil, scribe or similar device isinserted through an opening 38 and moved in a circular motion, therebycausing the rotor 36 to rotate about its instantaneous center whilesimultaneously having its outer periphery moved along the rollers 44. Aplurality of patterns or paths are traced by the pencil as the rotor isrotated, as indicated at 50, depending on the location of the opening 38through the rotor 36. By placing the openings 38 at any random locationin the rotor 36, an infinite number of different patterns or paths maybe placed on the material placed on the base plate 20. The positions ofthe rollers 44 may be adjusted in any manner on the base plate to modifythe patterns traced in any desired manner. If desired, the rollers 44and pivots 46 may be attached to a guide means and adjustable thereon,whereby the guide means can be placed on the base plate 20 and therollers 44 can then be adjusted along a slot in the guide means.

In the third embodiment illustrated in FIG. 4 a rigid rectilinear frame20 has a rectangular opening 48 in the interior thereof. A curved rotor36 having a plurality of openings 38 therethrough is placed within theopening 48 of the rectilinear frame 20. The curved rotor 36 isdimensioned in such a manner as to maintain a four point contact withthe interior surfaces of the rectilinear frame or base plate 20 at alltimes, as indicated at P P P and P In operation, the base plate 20 isplaced on the surface of the paper or material on which a pattern is tobe traced and the rotor 36 is placed in the opening 48 of the base plate20. A marking device such as a pencil, scribe, or similar device, isthen placed in any one of the openings 38 and moved in a closed pathmanner to cause the rotor 36 to rotate within the rectilinear frame orbase plate 20, thus generating a plurality of patterns or pathsindicated at 50. Any form of rotor may be employed in this embodiment,as long as the diameter of the rotor is kept constant and a fourpointcontact is maintained with the guide surfaces.

The embodiment illustrated in FIG. 5 utilizes two rectilinear frames 20and 20 connected together and adjustable relative to each other by anysuitable means. The adjusting means illustrated in the preferredembodiment incorporates a plurality of guide slots 26 located at each ofthe corners of the rectilinear frame members 20 and 20. The framemembers 20 and 20 are clamped together by any suitable clamping means,such as a bolt and nut assembly 28 extending through the guide slots 26of both frames. The adjustable double frame assembly 20 and 20 is placedon the surface of the paper or material on which patterns are to betraced and a curved triangular shaped rotor having openings 38therethrough is placed within the rectilinear frame assembly. The frameassemblies 20 and 20 and triangular rotor 36 are dimensioned in such amanner as to maintain a four-point contact between the rotor and guideframe assemblies as indicated at P,, P

P and P A marking device is placed through an opening 38 in the samemanner as described above with regard to the previous embodiments andthe rotor 36 is rotated, thereby causing a sliding contact between therotor 36 and the frame members 20 and 20. The movement of the markingdevice guided by the opening 38 on the surface of the paper causes apattern to be generated thereon. By adjusting the angular relationshipbetween the two frame members 20 and 20, a given point 38 on the rotorwill trace different patterns, depending upon the angle selected.

FIG. 6 illustrates a fifth embodiment of the subject invention in whicha base plate 20 has a circular opening 60 therein. A plurality of indexnotches 52 are formed in the base plate 20 about the circumference ofthe circular opening 60. A triangular shaped guide member 24 ispositioned within the circular opening 60 and has each of its corners 25in engagement with one of the guide notches 52 in the base plate 20. Anoval shaped rotor 36 having a plurality ofopenings 38 therethrough isplaced within the interior space in the triangular shaped guide member24 and is caused to rotate by a drawing instrument such as a pencil orscribe as described above, thus causing the drawing instrument to tracea pattern on a piece of paper or other material placed beneath the baseplate 20. The triangular shaped guide means or frame member 24 may beangularly adjusted and indexed in various notches 52 around thecircumference of the circular opening 60, thereby causing the openings38 and the rotor 36 to generate a variety of patterns. The rotor isdimensioned in such a manner as to maintain a three-point contact P,, Pand P In FIG. 7 a rotor 70 and a pair of stationary frame members 72 and74 are shown in a cross section and are provided with complimentary edgeportions to help maintain the planar relationship of the elements. Theflanges 76 and 78 on the frame members 72 and 74 respectively cooperatewith the groove 80 formed by the flanges 82 and 84 on the rotor 70. Acrank handle 86 may be connected to the rotor 70 at any convenientpoint, preferably at approximately the geometrical center thereof, tofacilitate the turning of the rotor 70 about its instantaneous center ofrotation while maintaining the rotor in at least two point contact withthe stationary frame. A spring biases scriber 88 may be located in theaperture 90 in the rotor. The spring 92 biases the scriber, which may bea pencil, ball-point pen or the like, against the writing surfacesubstantially independent of the downward pressure exerted on the rotor.Although the scriber support 94 is shown in threaded engagement with theaperture 90 in the rotor it is obvious that other securing means such asa snap ring or the like could be used to facilitate the transfer of thescriber from one aperture to another in the same or other rotors. Thevarious features shown in FIG. 7 may be used with any of the disclosedembodiments.

Also in all of the disclosed embodiments the kinematic inversionprinciple may be applied, that is, the stationary surfaces could becomethe movable surfaces and the movable surfaces could become the statonarysurfaces. In all instances the term stationary is used in a relativesense since the stationary members can be adjustably positioned on thesupport. Likewise, in the various modifications, such as FIG. 3, therollers are considered to be stationary since the roller is merelyprovided to reduce friction.

In the embodiment shown in FIG. 8, a rotor 36 having an elongated slot54 in one end thereof and a plurality of openings 38 in the other endthereof is guided on the surface of a piece of paper or similar materialplaced on base plate 20 by means of a first roller 44 traveling in aguide slot or groove 58 formed in a triangular shape guide frame 62. Asecond guide roller or pin 44 is positioned within the slot 54 of rotormember 36 and fixed to the frame or base plate 20. Again, the guide pin44 may have a sharp pointed pin or permanent magnet in one end thereoffor attaching the pin to the base plate 20 through the paper or materialon which a pattern is to be traced. The rotor 36 is rotated about thefixed guide pin 44 by a drawing instrument inserted through any selectedopening 38 resulting in a pattern 50 being traced. The location of thefixed pin 44 relative to the frame 62, as well as the position of theframe itself, may be altered to obtain different patterns. In addition,it is not necessary to use a triangular shaped frame 62, but any desiredconfiguration may be used as long as the two-point contact ismaintained.

The embodiments illustrated in FIGS. 9 and 10 utilize circular shapedrotors 36 having guide slots 54 formed therein and guided on the surfaceof a piece of paper or similar material placed on base plate 20 by meansof fixed rollers or guide blocks secured to the base plate 20. In thestructure illustrated in FIG. 9, three equally spaced grooves or guideslots 54 are formed in the circular rotor 36 across the diameterthereof. These straight slots 54 are formed in the rotor 60 apart. Threerollers 44 are secured to the base plate 20 through the material onwhich a pattern is to be traced by any suitable means, such as thosedescribed previously and are positioned in the form of an equilateraltriangle, that is, the rollers 44 are positioned on a circular 120apart. This causes each of the rollers to be positioned in threeadjacent slots. A drawing instrument is inserted in an opening 38located at any desired position on rotor 36 and is moved in a circularmanner, thus causing rotor 36 to rotate. As the rotor 36 rotates, theslots 54 will move relative to each of the fixed rollers 44, thuscausing the rollers 44 to move in the guide slots and allowing anopening 38 to generate a pattern as indicated at 50 in FIG. 9.

The structure illustrated in FIG. 10 is similar to that of FIG. 9,except that two slots 54 are formed in the rotor 36 and are spaced fromeach other. Each of these slots 54 extend across the diameter of therotor 36. Two elongated guide blocks 56 are pivotally secured to thebase plate 20 on top of a piece of paper or similar material positionedon the surface of base plate 20. As the rotor 36 is rotated by means ofa drawing instrument placed in an opening 38 therethrough the guideblocks 56 slide in the two slots 54 and cross at the center of he rotor,thus enabling a pattern to be traced on a surface by the drawinginstrument placed through opening 38. By adjusting the positions of theguide blocks 56 on the surface of base plate 20, any desired number ofdifferent patterns may be traced thereon. The guide slots in theembodiments shown in FIGS. 9 and 10 could also be curved.

In the embodiment illustrated in FIG. 11, a plurality of guide rollers44 are secured to the base plate 20 through the surface of a piece ofpaper on which a pattern is to be traced in a manner describedpreviously with reference to the other embodiments. A triangular shapedrotor 36 has two angularly related straight guide surfaces 64 formedtherein for maintaining at least a two-point contact with guide rollers44. A plurality of openings 38 are formed through the rotor 36 forgenerating a pattern 50 on a surface when the rotor is moved around theouter circumference of the rollers 44 by means of a drawing instrumentplaced in one of the openings 38. Although the guide surfaces 64 areillustrated as angularly related straight surfaces, the guide surfacesmay be formed in any configuration as long as the rotor 36 maintainscontact with at least two rollers at all times.

FlG. l2 discloses a lOth embodiment which incorporates a rotor 36 havinga circular guide opening 60 formed in one portion thereof and an arcuateshaped guide groove formed therein and spaced apart from the circularopening 60. Two guide rollers are used for guiding the movement of rotor36, one of the rollers 44 being secured to base plate through a piece ofsheet material on which a pattern is to be traced and located thereon.The second roller 44 is positioned in the circular groove 66 and securedto the base plate 20 in the same manner as the first roller. The meansfor securing the two rollers 44 in this embodiment may be the same asthose described above with regard to the other embodiments. Openings 38may be placed anywhere on the rotor 36 and a drawing instrument orsimilar device is inserted therein and moved to cause the rotor to beguided by the circular opening 60 and arcuate shaped slot 66 and theguide rollers in conjunction therewith, thus causing a pattern to begenerated on the surface of a piece of paper or a similar material. Therotor 36 and guide rollers 44 may be placed on the surface of base plate20 in any desired location, as long as the roller 44 always maintainscontact with the edge of the opening 60 of the rotor 36.

Although the drawing or tracing instrument, such as a pencil, scribe orother similar device was described above as being manually held inopening 18 through the rotor members 36, any other satisfactory methodof retaining the drawing device therewith, may be used such as a clipspring or clamping means secured to rotor 36 into which the drawinginstrument may be inserted and secured.

Although the preferred embodiments of the subject invention have beendescribed above as mechanical drawing devices, the subject invention isnot specifically limited thereto, but may be used as mechanical motiontransmitting devices by connecting various desired linkages to themoving members and supplying motive power thereto in any desired mannerto obtain a desired input and output motion or pattern.

What is claimed is:

l. A mechanical motion device for generating a plurality of patternscomprising a movable member for generating a specific path of motion, afixed guide means for guiding said movable member along a predeterminedpath, said movable member being maintained in sliding and rollingcontact with said fixed guide means in at least two points at all times,said two points of contact shifting relative to said fixed guide meansduring movement of said movable member, said movable member and saidfixed guide means each having non-circular surface between said twopoints of contact, means for supplying motor power to said movablemember to cause said movable member to rotate about an instantaneouscenter and simultaneously move relative to said fixed guide means whilemaintaining said two-point sliding and rolling contact therewith at alltimes, wherein said movable member is constructed of an oval shape, saidfixed guide means being two elongated straight members and furthercomprising a base plate for positioning said oval-shaped movable memberand said elongated straight guide members thereon, said elongatedstraight guide members positioned on said base in angular relationshipwith each other with one end of each guide member intersecting at acommon point, at least one opening in said ovalshaped movable member forgenerating a pattern on a surface of said base plate whereby saidmechanical motion device may be used as a mechanical drawing apparatusby inserting a drawing instrument through said opening in saidoval-shaped movable member and moving said drawing instrument.

2. A mechanical motion device as set forth in claim 1 further comprisingmeans for adjusting the angular relationship between said two elongatedguide means.

3. A mechanical motion device as set forth in claim 1 further comprisingmeans for removably securing said fixed guide means to said base platethrough a piece of material placed on the surface of said base plate.

4. A mechanical motion device as set forth in claim 1 further comprisinga spring biased lever removably and pivotally secured to said baseplate, said spring biased lever maintained in contact with saidoval-shaped movable member at all times, whereby a force is exerted onsaid oval-shaped movable member for maintaining the two point contactbetween said movable member and said guide means at all times.

5. A mechanical motion device as set forth in claim 1 further comprisingspring means biasing said movable member into contact with said fixedguide means.

6. A mechanical motion device for creating noncircular designscomprising a frame means and rotor means disposed in contact with saidframe means in at least two points of contact at all times in the sameplate during rotary movement of said rotor, means for moving said rotorrelative to said frame means, said two points of contact shiftingrelative to said frame means during rotary movement of said rotor meansabout its instantaneous center, said rotor means and said frame meanshaving surfaces between said points of contact which are non-circularand spring means for biasing said rotor means into engagement with saidframe

1. A mechanical motion device for generating a plurality of patternscomprising a movable member for generating a specific path of motion, afixed guide means for guiding said movable member along a predeterminedpath, said movable member being maintained in sliding and rollingcontact with said fixed guide means in at least two points at all times,said two points of contact shifting relative to said fixed guide meansduring movement of said movable member, said movable member and saidfixed guide means each having non-circular surface between said twopoints of contact, means for supplying motor power to said movablemember to cause said movable member to rotate about an instantaneouscenter and simultaneously move relative to said fixed guide means whilemaintaining said two-point sliding and rolling contact therewith at alltimes, wherein said movable member is constructed of an oval shape, saidfixed guide means being two elongated straight members and furthercomprising a base plate for positioning said oval-shaped movable memberand said elongated straight guide members thereon, said elongatedstraight guide members positioned on said base in angular relationshipwith each other with one end of each guide member intersecting at acommon point, at least one opening in said oval-shaped movable memberfor generating a pattern on a surface of said base plate whereby saidmechanical motion device may be used as a mechanical drawing apparatusby inserting a drawing instrument through said opening in saidoval-shaped movable member and moving said drawing instrument.
 2. Amechanical motion device as set forth in claim 1 further comprisingmeans for adjusting the angular relationship between said two elongatedguide means.
 3. A mechanical motion device as set forth in claim 1further comprising means for removably securing said fixed guide meansto said base plate through a piece of material placed on the surface ofsaid base plate.
 4. A mechanical motion device as set forth in claim 1further comprising a spring biased lever removably and pivotally securedto said base plate, said spring biased lever maintained in contact withsaid oval-shaped movable member at all times, whereby a force is exertedon said oval-shaped movable member for maintaining the two point contactbetween said movable member and said guide means at all times.
 5. Amechanical motion device as set forth in claim 1 further comprisingspring means biasing said movable member into contact with said fixedguide means.
 6. A mechanical motion device for creating non-circulardesigns comprising a frame means and rotor means disposed in contactwith said frame means in at least two points of contact at all times inthe same plate during rotary movement of said rotor, means for movingsaid rotor relative to said frame means, said two points of contactshifting relative to said frame means during rotary movement of saidrotor means about its instantaneous center, said rotor means and saidframe means having surfaces between said points of contact which arenon-circular and spring means for biasing said rotor means intoengagement with said frame means.